Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
1999-10-28
2003-05-27
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047320, C369S053340
Reexamination Certificate
active
06570831
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical recording medium recording/reproducing apparatus, and in particular to a data recording speed control apparatus and method for recording data on an optical recording medium. The present invention is capable of converting data inputted from a host into a recording format, recording the reformatted data on an optical medium at an initial speed, variably adjusting a recording format conversion speed of the data when a data input speed is changed, resetting the speed for recording the reformatted data on an optical recording medium, and recording and reproducing the reformatted data at the reset recording speed.
2. Description of the Background Art
FIG. 1
is a view illustrating a conventional optical recording medium recording/reproducing apparatus. As shown therein, the conventional optical recording medium recording/reproducing apparatus includes an interface unit
30
for receiving data from an external host
32
and transferring the same to a buffer
19
, a digital recording signal processor
20
for converting data from the buffer
19
into a certain recording format by providing an error correction code to the data from the buffer
19
, a bit encoder
21
for converting the recording format data into bit stream data, a amplifier
13
for amplifying a wobble signal of the optical recording medium
10
read from an auxiliary beam of the optical pick-up unit
11
at a certain level, a wobble data detector
14
for detecting wobble data corresponding to an amplified low frequency wobble signal, a ATIP synchronous signal detector
15
for detecting an ATIP synchronous signal generation unit
17
for generating a reference ATIP synchronous signal, an error detector
16
for detecting a phase difference between an ATIP synchronous signal from the ATIP synchronous signal detector
15
and a reference ATIP synchronous signal from the reference ATIP synchronous signal generation unit
17
, a motor driving unit
18
for varying the data recording speed of an optical recording medium by applying a driving voltage corresponding to the detected phase difference to the spindle motor
12
, and a microcomputer
25
for receiving wobble data from the wobble data detector
14
, controlling variably the data conversion speed of the digital recording signal processor
20
and controlling operation of the laser diode driving unit
22
.
The operation of the thusly constituted optical recording medium recording/reproducing apparatus will now be explained.
First, when a data record is requested from the host
32
(for example, PC) for recording optical recording medium, the data outputted from the host
32
via the interface unit
30
is temporarily stored in the buffer
19
. When buffer
19
stores the inputted data, the digital recording signal processor
20
sequentially reads out the data temporarily stored in the buffer
19
and outputs it to the bit encoded
21
at an initial speed.
The bit encoder
21
converts the processed signal data into a bit stream and outputs it to the laser diode driving unit
22
, and the laser diode driving unit
22
outputs a driving voltage corresponding to the bit stream to a laser diode of the optical pick-up unit
11
. Then, the laser diode scans the main laser beam across the recording surface of the optical recording medium in accordance with the driving voltage corresponding to the bit stream, thereby recording the inputted data.
While the inputted data is being recorded on the optical recording medium, an auxiliary beam formed on the recording surface of the optical recording medium detects a low frequency wobble signal from the optical recording medium together with the main beam, and the detected low frequency wobble signal is amplified to a certain level by the amplifier
13
. A shown in
FIG. 2
, corresponding wobble data is detected by the wobble data detector
14
.
As shown in
FIG. 3A
, when a reference ATIP synchronous signal is outputted from the reference ATIP synchronous signal generation unit
17
, as shown in
FIG. 3B
, the ATIP synchronous detector
15
generates an ATIP synchronous signal whenever the ATIP synchronous detector
15
detects a ATIP synchronous signal. The error detector
16
compares a phase difference between the ATIP synchronous signal and the reference ATIP synchronous signal. As shown in
FIG. 3C
, error amounts e
1
and e
2
are detected.
The thusly detected error amounts e
1
and e
2
are applied to the motor driving unit
18
, and as shown in
FIG. 3D
, the motor driving unit
18
applies a driving voltage corresponding to the error amount to the spindle motor
12
, so that a recording speed of the recording/reproducing apparatus is controlled, and the recording speed based on the main beam is maintained. The ATIP synchronous signal is compared with the reference signal. As a result of the comparison, if the pulse width of the ATIP synchronous signal is larger than the pulse width of the reference signal, as shown in
FIG. 3D
, the motor driving unit
18
accelerates the spindle motor by the error amount e
1
, and on the contrary, the spindle motor is decelerated by the error amount e
2
. Therefore, the recording/reproducing apparatus of the optical recording medium uniformly maintains the recording speed of the data irrespective of the speed of the data inputted.
In the conventional recording/reproducing apparatus of the optical recording medium, when reproducing the data recorded on the optical recording medium, the reproducing speed variable operation is performed in the same manner as the recording speed variable operation.
However, when data is inputted from the host
32
and recorded data is reproduced at an initial speed for a certain period, the recording speed is varied based on the synchronous detection speed of the wobble data detected so that an initial recording speed is maintained and controlled.
At this time, when the data output speed from the host
32
is sharply increased or decreased, an error occurs in the recording operation of the optical recording medium recording/reproducing apparatus which operates at a uniform recording speed. In particular, in the case that the initial recording speed is high (e.g., 4×, 6×, 8×), when the host
32
performs an e-mail transmission or operates based on an internal interrupt operation, the data output speed of the host
32
is decreased. At this time, if there is no data inputted in the buffer
30
, since a uniform recording speed of the optical recording medium recording/reproducing apparatus is maintained, the data may be incorrectly recorded, thereby causing a fatal error in the optical recording medium.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a data recording speed control apparatus for an optical recording medium recording/reproducing apparatus which is capable of variably adjusting recording speed for recording data onto an optical recording medium in accordance with the input speed of data by determining the data input speed.
It is another object of the present invention to provide a data recording speed control method of an optical recording medium recording/reproducing apparatus which is capable of variably adjusting the recording speed for recording data onto an optical recording medium in accordance with an input speed of data, by determining the data input speed.
To achieve the above objects, there is provided a data recording speed control apparatus of an optical recording medium recording/reproducing apparatus which includes a storing unit for storing inputted data, a data conversion unit for converting the stored data into a certain recording format at a certain speed, a recording unit for recording the converted data onto an optical recording medium, and a control unit for variably setting the conversion speed based on the amount of data stored in the storing unit.
To achieve the above objects, there is provided a data recording speed control method of an optical recording medium reco
Birch & Stewart Kolasch & Birch, LLP
Huber Paul W.
LG Electronics Inc.
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